JPH04330695A - Assembly method for magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of metallic friction powder due to the friction of both members by deforming a clamping member with prescribed pressure and fixing the member with a joint member. CONSTITUTION:A clamping holder 18 is made to abut on the internal peripheral part of a clamp 11 and prescribed pressure is given to the holder 18. Pressure force in a size which can fix the magnetic disk 8 to a spindle hub 10 with prescribed force by the pressure force of the holder 18, 1000-2000kgf, for example, is given and the ring 11 is bent for a prescribed amount. A bearing 6 whose assembly terminates is bent lest unnecessary force is operated. Furthermore, the ring 11 is fixed by jointing six bolts 13. Then, the holder 18 is removed, a cover is assembled and the assembly of the fixed mechanism part 12 is completed.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to an assembly technique for a magnetic disk drive, and in particular, to prevent the generation of metal abrasion powder when clamping a magnetic disk to a spindle hub. The present invention relates to a technique that is effective when applied to a method for assembling a highly reliable magnetic disk device that does not cause loss of magnetically recorded information due to powder.

0002

2. Description of the Related Art Conventionally, magnetic disk drives have often adopted a structure in which a plurality of magnetic disks are fixed to a spindle hub using a clamp ring. For example, as shown in FIG. 4, nine magnetic disks are stacked. The magnetic disk device 1 is composed of a spindle rotating section and the like, and includes a drive mechanism section 5 including a shaft 2, a rotor 3, a stator 4, etc., a bearing 6, a base 7, a magnetic disk 8, a spacer 9, a spindle hub 10, and Clamp ring (
The fixing mechanism section 12 includes a clamp member) 11 and the like.

When assembling, the magnetic disks 8 are sequentially stacked on the spindle hub 10 with spacers 9 interposed therebetween, and the clamp ring 11 is then tightened with a tightening tool 14 via a tightening bolt (fastening member) 13. The magnetic disk 8 is attached to the spindle hub 10 by tightening, and the magnetic disk 8 is attached to the spindle hub 10 by using the elastic deformation of the clamp ring 11.
It has a structure that allows it to be fixed by pressure welding.

0004

However, in the prior art as described above, when elastically deforming the clamp ring, the head of the bolt is pressed against the clamp ring while tightening the tightening bolt. The clamp ring is elastically deformed and bent by the axial force of the bolt.

In this case, the head of the bolt is tightened while slipping on the surface of the clamp ring, so there is a problem that the contact area between the clamp ring and the head of the bolt rubs and metal abrasion powder is generated. .

In particular, in a magnetic disk drive, the surface of the magnetic disk and the magnetic head are close to each other with a minute gap of about 0.2 μm, and moreover, both rotate at a high speed of about 60 m/s due to the rotation of the magnetic disk. Because of the relative movement, even if the metal powder is about 1 μm at most, if it gets caught in the tiny gap between the magnetic head and the magnetic disk, it will cause a large local load, and the 0.5 μm metal powder coated on the surface of the magnetic disk will cause a large load. This destroys the thin magnetic recording film, making it impossible to record and reproduce information.

Therefore, in order to prevent such problems, for example, Japanese Patent Laid-Open No. 1-106387 discloses that members such as resin insert nuts and bushes are installed in the contact area between the clamp ring and the fastening bolt. A structure for providing is disclosed.

However, even with the above structure, although the wear between the clamp ring and the bolt can be reduced, the two still rub against each other, and resin abrasion powder is generated instead of metal abrasion powder, so that a sufficient effect cannot be obtained. It is not possible.

Furthermore, the structure of the magnetic disk drive becomes complicated due to the addition of resin insert nuts and the like.
There are problems such as increased manufacturing costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a magnetic disk device that can prevent the generation of metal abrasion particles when clamping a magnetic disk to a spindle hub while maintaining the same structure as the conventional clamp ring and spindle hub. The objective is to provide an assembly method for the.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

0012

[Means for Solving the Problems] Among the inventions disclosed in this application, a brief overview of typical inventions will be as follows.
It is as follows.

That is, the method for assembling a magnetic disk device of the present invention includes at least one magnetic disk, a spindle hub that rotatably holds the magnetic disk, and a clamp member that clamps the magnetic disk to the spindle hub. , a method for assembling a magnetic disk device in which magnetic disks are rotatably pressed and fixed to a spindle hub via a clamp member, the magnetic disks are sequentially stacked at predetermined intervals on the spindle hub via spacers, and the magnetic disks are When a disk is pressed and fixed by a clamp member, the clamp member is deformed in advance by applying a predetermined pressing force, and then the clamp member is fixed by a fastening member with a predetermined fastening force.

[0014] Furthermore, when applying a predetermined pressing force to the clamp member, the lower part of the spindle hub is pressed while being in contact with the reference surface of the base.

In this case, the clamp member is a substantially ring-shaped clamp ring made of an elastic metal body, and is provided with a pressing means for elastically deforming the clamp ring by a predetermined amount. After the magnetic disk is elastically deformed, the fastening means is tightened by a predetermined amount, and the magnetic disk is held on the spindle hub even after the pressing means is released.

[0016]

[Operation] According to the method for assembling a magnetic disk drive described above, the clamp member, for example, a substantially ring-shaped clamp ring formed of an elastic metal body, is elastically deformed in advance by a predetermined amount by a predetermined pressing force by the pressing means. Later, by tightening the fastening member by a predetermined amount with a predetermined fastening force, the pressing means only pushes the surface of the clamp ring vertically, and in this state, the fastening member can be fixed without being tightened more than the predetermined amount. Can be done.

[0017] This eliminates the conventional process of tightening the clamp ring and the fastening member while rubbing against each other, and it is possible to prevent metal abrasion powder from being generated due to the friction between the two.

[0018] Furthermore, when the lower part of the spindle hub is in contact with the reference surface of the base, a predetermined pressing force is applied to the clamp member, thereby preventing undue force from being applied to the drive mechanism, etc., including the assembled base. can be prevented from acting.

[0019] This makes it possible to prevent other assembly completion mechanisms from being affected when the clamp ring is attached.

[0020]

Embodiment FIG. 1 is a cross-sectional view showing the main parts of a magnetic disk device according to an embodiment for explaining the method of assembling the magnetic disk device of the present invention, and FIG. 2 is a clamp member of the magnetic disk device of this embodiment. FIG. 3 is a sectional view showing the completed state of the main parts of the magnetic disk device of this embodiment.

First, the configuration of the main parts of the magnetic disk device of this embodiment will be explained with reference to FIG.

The magnetic disk device of this embodiment is, for example, an inner rotor type magnetic disk device 1a in which nine magnetic disks are stacked as in the prior art. A drive mechanism unit 5 equipped with a stator 4 and the like disposed on the outer periphery of the magnetic disk 8 is housed inside a base 7 fixed via a bearing 6, and the magnetic disk 8 is placed in a predetermined position via a spacer 9. It consists of a spindle hub 10 that rotatably holds the magnetic disk 8 at intervals of It is attached via 16.

In the drive mechanism section 5, for example, the rotation direction of the rotor 3 on which magnets are arranged is controlled by switching the direction of current to the stator 4 around which the armature coil is wound, and accordingly, the rotor 3 is integrated with the rotor 3. The shaft 2 is rotated in the same direction.

In the fixing mechanism section 12, a plurality of magnetic disks 8 are stacked on a spindle hub 10 at a predetermined interval via spacers 9, and these magnetic disks 8 are secured to the spindle by a clamp ring 11 provided at the top. It is held and fixed to the hub 10.

As shown in FIG. 2, the clamp ring 11 is formed into a substantially ring-shaped plate made of an elastic metal such as an aluminum alloy, and is fixed to the spindle hub 10 by screws through six mounting holes 17.

Next, regarding the operation of this embodiment, in particular, the assembly of the drive mechanism section 5 is completed by attaching the base 7,
The case of assembling the fixing mechanism section 12, which is a feature of the present invention, will be explained.

First, the magnetic disks 8 are sequentially stacked on the spindle hub 10 press-fitted into the shaft 2 with spacers 9 interposed therebetween. After the stacking of the magnetic disks 8 is completed,
Attach the clamp ring 11 to the top of the bolt (fastening member) 13
The plurality of magnetic disks 8 are rotatably fixed to the spindle hub 10 by pressure contact.

In this case, in the conventional mounting of the clamp ring 11, as shown in FIG.
Since there is a gap between the bolt 13 and the spindle hub 10, the more strongly the bolt 13 is tightened with the tightening tool 14, the more the elastic deformation of the clamp ring 11 becomes. 1
It is strongly fixed to 0.

However, the head of bolt 13 is
Clamp ring 11 is tightened with strong force as 3 is tightened.
As it rotates while being pressed by the magnetic disk, metal abrasion powder is generated at the contact area between the two, and if this scatters and adheres to the surface of the magnetic disk 8, it gets caught in a minute gap between the magnetic head and the magnetic head (not shown) when it passes. There is a problem in that the film of the magnetic recording medium on the surface of the magnetic disk 8 is destroyed.

Therefore, in the present invention, before tightening the six bolts 13, as shown in FIG. 18, the predetermined pressing force P, that is, the amount of deformation of the clamp ring 11 is such that the magnetic disk 8 can be fixed to the spindle hub 10 with a specified force by the pressing force of the clamp ring presser 18, for example, a pressing force of usually about 1000 to 2000 kgf. By applying pressure, the clamp ring 11 is predeflected by a predetermined amount.

At this time, the lower part 19 of the spindle hub 10 is pressed against the reference surface 20 of the base 7 to prevent the clamp ring from being applied to the assembled drive mechanism section 5, especially the bearing 6. Deflect 11.

In this case, the pressing part 21 of the clamp ring presser 18 comes into contact with the surface of the clamp ring 11, but only pushes the clamp ring 11 in the axial direction, and does not involve rotation as in the conventional case, so the clamp ring Metal abrasion powder is not generated at the contact portion with 11.

Further, in a state in which the clamp ring 11 is bent to a predetermined amount capable of holding the magnetic disk 8, the six bolts 13 are tightened to fix the clamp ring 11.

In this case, there is no need to strongly tighten the bolt 13; it is sufficient to tighten the bolt 13 to the extent that the head of the bolt 13 lightly touches the surface of the clamp ring 11, which has already been bent, so that the bolt 13 and the clamp ring 11 are tightly tightened. No metal wear particles are generated on the contact surfaces.

After all the bolts 13 have been tightened, the clamp ring presser 18 is removed. In this case, even after the clamp ring presser 18 is removed, the clamp ring 11 is held down by the bolt 13, so the amount of deflection is maintained as it is, and as with the conventional method, the bolt 13
The same effect as bending the clamp ring 11 while tightening the clamp ring 11 can be obtained.

Further, after fixing the magnetic disk 8 to the spindle hub 10, the cover 15 is closed as shown in FIG.
Then, the bearing 16 is assembled, and the spindle hub 10 is lifted from the reference surface 20 of the base 7 to be in a rotatable state. This completes the assembly of the fixing mechanism section 12.

Therefore, the magnetic disk device 1a of this embodiment
According to the assembly, the clamp ring 11 is deformed by a predetermined amount using the clamp ring presser 18, and then the bolt 13 is tightened, so that the clamp ring 11 and the bolt 13 are tightened while rubbing against each other as in the conventional method. This eliminates the step of rubbing the two together, and prevents the generation of metal abrasion powder due to friction between the two.

Note that when the clamp ring 11 is bent by the clamp ring presser 18, the clamp ring 1
Needless to say, care must be taken to ensure that the part 1 does not slip or rotate while being pressed.

[0039] Above, the invention made by the present inventor has been specifically explained based on examples, but the present invention is not limited to the above-mentioned examples, and can be modified in various ways without departing from the gist thereof. Needless to say.

For example, although the magnetic disk device of this embodiment has been described as an inner rotor type magnetic disk device 1a, the present invention is not limited to the above embodiment; for example, an outer rotor type magnetic disk device, It is also widely applicable to other magnetic disk devices such as axial type.

Furthermore, the shape of the clamp ring 11 is not limited to the shape shown in FIG.
It goes without saying that the number of mounting holes 17 and the like can also be changed in various ways.

Furthermore, the material of the clamp ring 11 is not limited to aluminum alloy, and it goes without saying that other elastic metal bodies can be used.

[0043]

[Effects of the Invention] Among the inventions disclosed in this application, the effects obtained by the typical inventions are briefly explained as follows.
It is as follows.

(1). When magnetic disks are stacked one after another at predetermined intervals on a spindle hub via spacers, and these magnetic disks are further pressed and fixed by a clamp member, after applying a predetermined pressing force to the clamp member to deform it in advance, By fixing the clamp member with the fastening member with a predetermined fastening force, the surface of the clamp member can be pushed in the vertical direction by the pressing means, and the clamp member can be fixed without tightening the fastening member more than the predetermined amount.
This eliminates the process of tightening the clamp member and the fastening member while rubbing against each other, and it is possible to prevent metal abrasion powder from being generated due to the friction between the two.

(2). When applying a predetermined pressing force to the clamp member, by pressing with the lower part of the spindle hub in contact with the reference surface of the base, it is possible to prevent the force from acting on the assembled mechanism. It is possible to prevent other assembly completion mechanisms from being affected in the member attachment process.

(3). According to (1) above, it is possible to prevent the generation of metal abrasion particles when assembling a magnetic disk device, especially when fixing a magnetic disk to a spindle hub. A highly reliable magnetic disk device can be obtained by suppressing troubles such as damage to magnetically recorded information caused by entanglement.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the main parts of a magnetic disk device, which is an embodiment for explaining a method of assembling a magnetic disk device according to the present invention.

FIG. 2 is a perspective view showing a clamp member of the magnetic disk device of this embodiment.

FIG. 3 is a sectional view showing a completed state of the main parts of the magnetic disk device of this embodiment.

FIG. 4 is a sectional view showing a main part of a magnetic disk device, which is an example for explaining a conventional method of assembling a magnetic disk device.

[Explanation of symbols]

1 Magnetic disk device 1a Magnetic disk device 2 Shaft 3 Rotor 4 Stator 5 Drive mechanism section 6 Bearing 7 Base 8 Magnetic disk 9 Spacer 10 Spindle hub 11 Clamp ring (clamp member) 12 Fixing mechanism section 13 Bolt (fastening member) 14 Tightening Tool 15 Cover 16 Bearing 17 Mounting hole 18 Clamp ring presser (pressing means) 19 Lower part 20 Reference surface 21 Pressing part

Claims (3)

[Claims] 1. At least one magnetic disk, a spindle hub that rotatably holds the magnetic disk, and a clamp member that clamps the magnetic disk to the spindle hub, the magnetic disk being clamped by the clamp member. A method for assembling a magnetic disk device in which the magnetic disks are rotatably fixed to the spindle hub by pressure contact through the spindle hub, the magnetic disks are sequentially stacked at predetermined intervals on the spindle hub via spacers, and the magnetic disks are then fixed to the spindle hub by the clamp. A method for assembling a magnetic disk device, which comprises applying a predetermined pressing force to the clamp member to deform it in advance, and then fixing the clamp member with a fastening member with a predetermined fastening force when the clamp member is fixed by pressure contact. . 2. The magnetic disk drive assembly according to claim 1, wherein when applying a predetermined pressing force to the clamp member, the clamp member is pressed while a lower part of the spindle hub is in contact with a reference surface of the base. Method. 3. The clamp member is a substantially ring-shaped clamp ring made of an elastic metal body, and includes pressing means for elastically deforming the clamp ring, and the clamp ring is deformed by a predetermined amount by the pressing means. 3. The magnetic disk drive assembly according to claim 1, wherein the fastening means is tightened by a predetermined amount after the pressing means is released, and the magnetic disk is held on the spindle hub even after the pressing means is released. Method.